MariaDB [test]> create table i1(f float);

Query OK, 0 rows affected (0.719 sec)

MariaDB [test]> insert into i1 values (0.0025);

Query OK, 1 row affected (0.490 sec)

MariaDB [test]> insert into i1 values (-0.0025);

Query OK, 1 row affected (1.063 sec)

MariaDB [test]> select round(f,2) from i1;

+------------+

| round(f,2) |

+------------+

|       0.00 |

|      -0.00 |

+------------+

2 rows in set (0.001 sec)